Here is the full list of all 49 Metro 2033 Redux achievements. It takes around 25-30 hours to unlock all of the achievements on Windows.
Find the truth.
Complete the game in Survival Mode.
Complete all 51 of Artyom's hidden Diary pages.
Find all Ranger stashes in Dead City.
Complete the level BLACK STATION without killing or knocking out any enemies.
Open 15 locked safe boxes.
Complete FRONTLINE level without killing anyone.
Help the poor, a coin for the kid, medicine for the sick. You help everyone you see.
Become a true ranger.
Complete the game in Spartan Mode.
Kill 2 demons.
Save 1000 military-grade rounds.
Kill 5 amoebas.
Kill 10 Spiders.
Kill at least one enemy with each weapon available in the game
Get 30 kills with Hellbreath.
Kill 30 enemies with a flamethrower.
Kill a librarian.
Drink at every occasion.
Exchange 500 Military-Grade 5.45 rounds at Exchange kiosks.
Make 30 deals in weapon shops.
On the level OUTPOST reach the radio tower and broadcast the commander's message.
Kill 20 lurkers.
Kill 200 Mutants.
Disarm 15 wire traps.
On the level DEPOT silently kill the first guard and break into the Fascist station unnoticed.
Kill 100 nosalises.
Kill 50 humans with pneumatic weapons.
Kill 100 enemies with shotguns.
Kill 100 enemies with assault rifles.
Kill 15 human enemies with Headshots from at least 30 meters' distance.
Kill 100 enemies using revolvers.
Explode 30 enemies.
Knock 30 human enemies out in close combat.
Kill 30 enemies with flame grenades.
Use a Medkit 75 times.
Kill 30 human enemies in close combat.
Kill 30 enemies with throwing knives.
On the level FRONTLINE kill all of the enemy Red Army and Fascist Soldiers.
Stealthily kill 15 Enemies.
Kill 100 Human Enemies.
Kill 30 human enemies with headshots.
Save a group of Reds from Fascist captivity.
Blow up the tunnel and airlock at CURSED STATION.
Kill 50 Watchmen.
Spend 60 seconds in a Radiation Hotspot.
On the level HUNTER kill the nosalises before they break through the ventilation grilles.
Kill 10 Enemies in a row without taking any damage.
Wipe your Gas Mask 20 times.